leg touching is weird. boob and butt touching obviously. face usually. this girl i didn't know put her hand on my stomach and rested it there for like 2 minutes one time and that was very awkward so i'll add that to the list too.

I think the OP is really inappropriate but I can see how in some circumstances and social contexts, it could be a totally fine and funny joke. It's up to the toucher to determine whether the context is appropriate and it's 100% his/her fault if the touchee gets offended, imo.

I'm not a toucher, but when being touched, like Fid said, it's all about intention. I'd be a bit uncomfortable with a guy having his hand on my leg. If it were a joke, I'd probably play along. Touch and physicality is high risk from an animalistic point of view, people naturally have strong reactions.